Oxygen sensor and check engine light

gray · Post by **gray** » Mon Jan 20, 2014 10:56 pm

If i disconnect the o2 sensor should not the idiot light on the dash have come on. Or does my 2000 406 2l petrol not monitor this?
Has been running real rich so i disconnected for 3 days now and nothing. To complicate things its running better, more even power , less travel of the pedal for the acceleration. I reset the computer and after 100 km run it is even better fuel economy not just a little... Was getting about 12L/100km now it says 9/100. Any ideas why all this to me is confusing. Getting a new o2 sensor on the weekend at peugeot. But Would a generic work just as fine?

Post by **steve_earwig** » Mon Jan 20, 2014 11:07 pm

I really think that the idiot light would come on, did someone remove the bulb?

I wouldn't be too sure that the sensor is the problem, if it's putting the engine into limp home mode (safety program) then it will be using a back-up map which will be ignoring a lot of the sensors on the engine, possibly the real culprit for your problems. I'm not saying that it isn't the problem, just it might not be...

No idea if a generic will work on these engines, my only experience is on the Toyota and I wasted my money (not just the sensors either

)

gray · Post by **gray** » Tue Jan 21, 2014 12:31 am

so what would put it into limp mode, the o2 sensor? and why would it come out of limp mode when disconnected?

i have done a lot of reading about this, i think it could be these maybe as well, Temp sens, map sen..

Post by **steve_earwig** » Tue Jan 21, 2014 1:01 am

Removing the o2 sensor should put it into limp home mode. When it's connected there's obviously a fault somewhere which is giving you the obscene fuel consumption but maybe the engine isn't detecting it as a fault and it's not going to limp home mode. I just don't understand why it's not putting up a fault light at all. Does it come on with the ignition?

It could be a lot of things, you need some proper diagnostics and maybe some readings for those better in the know to look at.

gray · Post by **gray** » Tue Jan 21, 2014 1:07 am

i will have a check for the light tomorrow on start up.
what i do know is that the airbag lights come on and the stop light in red, some pic of car tilted in orange
what should the light for check engine be? just a pic of engine in orange or words?

Post by **steve_earwig** » Tue Jan 21, 2014 1:16 am

I *think* it should be an orange picture of an engine, somewhere along the bottom of the dash below the STOP light.

mjb · Post by **mjb** » Tue Jan 21, 2014 10:21 am

My experience with a tubby was that removing the o2 sensor did not put the EML on. Can't say if it engaged limp-home or not, because the turbo was knackered anyhow, but it did improve performance because the cat was obviously rather clogged. Bloody noisy though

gray · Post by **gray** » Tue Jan 21, 2014 3:41 pm

so light is there working on start up!

gray · Post by **gray** » Sun Jan 26, 2014 1:50 am

So i went to the dealer today to get the oxygen sensor after 2 weeks ago quoting me $111 US they didnt have it in stock so i asked if i can order it, sure that will be $275 US.

I have converted these prices as i live in the dominican republic and there is only one dealer in the whole country. There is no way i will pay that much for a o2 sensor. Can i not use a generic one with the same wiring format (for ex a 2 wire with a 2 wire)

Has anybody out there done this before and just splice the original connector into the new o2 sensor, for ex from a toyota? (as there are plenty of those here on the island)

Or can anybody suggest another brand that has worked well for them?

Thanks for all your help

Post by **steve_earwig** » Sun Jan 26, 2014 8:12 am

Isuse

Not sure which engine I need to go for but 2.0 138bhp 1628hv downstream is just over 200 quid

And you don't even know if this is the problem.

My experience of using generic probes on a Toyota is that they don't do the job. But I've come to the conclusion that replacing the upstream air/fuel sensor and the downstream O2 sensor with the same generic is probably where we went wrong. How much is a generic there?

Can you get any diagnostics done?

DO you have any way of paying for things outside DR? I'm thinking http://www.worldcarparts.co.uk/Store/ta ... rch=1628hv

Post by **steve_earwig** » Sun Jan 26, 2014 8:25 am

I just looked at the postage on that site, 45 pounds to the Dominican Republic

I guess you won't have to pay the tax but you'll probably be raped for import duty...

I suppose you'd want to try a generic and see if it made the engine happy but, without the engine light, you'd only be able to tell by driving it for a while and if it was the same you still wouldn't know if it was the lamda or still something else. Diagnostics you need.

Post by **steve_earwig** » Sun Jan 26, 2014 9:06 am

I just saw in your other post the engine is RFV, this only has 1 lambda

There is still a choice of 2:
1628 8C - POLLUTION CONTROL OXYGEN PROBE 12W LONG 1250 - CATALYTIC CONVERTER WITHOUT COMPOSITE
1628 9S - 12W LONG 1250MM - 3 PARTS CATALYST
Both still very expensive.

WCP still about the same but Google found http://www.miparts.com/oem/1628%208C or http://www.miparts.com/detail/lambda-se ... uTRCLQo-e0

And they ship to DR...

gray · Post by **gray** » Sun Jan 26, 2014 11:53 am

thanks Steve for your replies and the legwork you have done here, i am going to look into it!

as its only 8 am here i will get to it this after my "Honey do this list"

as per the photos looks like its a 4 wire lambda probe...single upstream system

shipping here is not going to be easy, our town is close to Haiti and there are barely street names and nobody has numbers on houses. so getting here not much will

i am returning home to Canada for a few months so could have it shipped there in near future. so that being said for now what can i do?

anybody know of a good 4 wire lambda sensor from another make preferable toyota, mitsibishi, or honda? As these vehicles are plentiful here and i might be able to get one to tie me over til the correct one.

Post by **steve_earwig** » Sun Jan 26, 2014 4:49 pm

You're Canadian?

I get the impression that English isn't your first language so do you speak French? If you do then you can also ask this stuff on passion-406, they seem to cover a lot of ground before we do so they might be able to help.

gray wrote:shipping here is not going to be easy, our town is close to Haiti and there are barely street names and nobody has numbers on houses. so getting here not much will

So how do they get bills to you?

Is there somewhere that has a real address that you can have stuff sent to?

I really don't know anything about these universals, however I came across this http://www.meat-doria.com/product_meat/81515 which seems to cover both alternative sensors, as well as several Mitsubishis and Toyota part numbers. We can't do anything with the Mitsis but we can search for parts on Toyodiy http://www.toyodiy.com/parts/

TOYOTA 8946520300 - General 03/1992-04/1998 TOYOTA CORONA AT190,ST191,CT190 84-01: SWITCH & RELAY
TOYOTA 8946524050 - N. America 04/1991-06/2000 LEXUS SC300/400 UZZ30,JZZ31 84-01: SWITCH & RELAY
TOYOTA 8946550010 - General 12/1989-09/1994 LEXUS LS400 UCF10 84-01: SWITCH & RELAY / N. America 05/1989-09/1994 LEXUS LS400 UCF10 84-01: SWITCH & RELAY

(I didn't bother searching for cars sold in Japan or Europe...)

I guess it depends on the suppliers you have there, which products made by which manufacturers. Can you find out what they're selling?

gray · Post by **gray** » Sun Jan 26, 2014 5:35 pm

steve_earwig wrote:You're Canadian? I get the impression that English isn't your first language so do you speak French?

LOL, is my English that bad? sorry, no my first language is English.

i will work on my grammar. But to be fair, English when in school was my worst subject. Good thing i aced construction and auto mechanics.

steve_earwig wrote:So how do they get bills to you? Is there somewhere that has a real address that you can have stuff sent to?

well my internet bill comes by email and the electric bill a man comes to my gate and rolls it up with a stone, not even in an envelope and throws it into my gallery surrounded by razor wire! -ps no joke
yes i live in a 3rd world country! where luxuries are water everyday and 24hr lights.

as regards shipping something, well i guess i could have it shipped to my lawyers in the capital and then they could put it on a bus that travels here then i could meet the driver at the side of the road when he calls my cell phone....

crazy place here... probably just wait til i am in Canada

steve_earwig wrote:I guess it depends on the suppliers you have there, which products made by which manufacturers. Can you find out what they're selling?

Yes i will look into it!
The reason i wanted a certain model of car that works, is because at the places to buy parts here they won't help you if you don't have a specific part you want. the reality is they know little about anything and have no imagination to try. But they can do great pop a wheelies on their 100cc 2 stroke motorcycles.

hope all this helps for you guys to understand my predicament. if i can locate something locally its much easier for me. Because toyota Honda Mitso are plentiful here it will be easier to tie me over till i get the correct part.

thanks Steve for all your research so far. I will be following up with this research

Gray

406oc.co.uk